#define _CRT_SECURE_NO_WARNINGS 1
#include "Heap.h"

void HPInit(HP* php)
{
	assert(php);
	php->a = NULL;
	php->capacity = 0;
	php->size = 0;
}

void HPDestory(HP* php)
{
	assert(php);
	free(php->a);
	php->a = NULL;
	php->capacity = 0;
	php->size = 0;
}

void AdjustUp(HPDataType* a, int child)
{
	int parent = (child - 1) / 2;

	while (child>0)
	{
		if (a[child] < a[parent])
		{
			Swap(&a[child], &a[parent]);
			child = parent;
			parent = (child - 1) / 2;
		}
		else
		{
			break;
		}
	}
}
void HPPush(HP* php, HPDataType x)
{
	if (php->size == php->capacity)
	{
		if (php->capacity == 0)
			php->capacity = 4;
		else
			php->capacity *= 2;
		HPDataType* tmp = (HPDataType*)realloc(php->a, php->capacity * sizeof(HPDataType));
		php->a = tmp;
	}
	php->a[php->size] = x;
	(php->size)++;
	AdjustUp(php->a, php->size-1);
}
void Swap(HPDataType* a, HPDataType* b)
{
	HPDataType tmp = *a;
	*a = *b;
	*b = tmp;
}
void AdjustDown(int* a, int n, int parent)
{
	int child = parent * 2 + 1;
	while (child < n)
	{
		if (child + 1 < n && a[child + 1] < a[child])
		{
			child++;
		}
		if (a[child] < a[parent])
		{
			Swap(&a[child], &a[parent]);
			parent = child;
			child = parent * 2 + 1;

		}
		else
			break;
	}
}
void HPPop(HP* php)
{
	assert(php);
	assert(!HPEmpty(php));

	Swap(&php->a[0], &php->a[php->size - 1]);
	php->size--;
	AdjustDown(php->a, php->size, 0);
}
HPDataType HPTop(HP* php)
{
	assert(php);
	assert(!HPEmpty(php));
	return php->a[0];
}
bool HPEmpty(HP* php)
{
	assert(php);
	return php->size == 0;
}
int HPSize(HP* php)
{
	return php->size;
}